Parallel Circuit - Constant Watt For Frost Protection

Parallel circuit heating tape is designed to be cut from reel lengths and site terminated to suit pipe work. The heating tape consists of a number of short heating zones, up to 1m long, each connected across a pair of continuous bus-wire conductors.

Each complete heating zone will give its full rated design output, 8, 12, 16 or 20 W/m, with circuit voltage applied to the bus-wire conductors. Normal rated voltage is 110v or 230v AC.

CONSTRUCTION

The heating tape has a core comprising two bus-wire conductors contained within an extruded silicone rubber sheath. This sheath is notched on alternate sides, at predetermined intervals, to expose a short section of bus-wire conductor.

Nichrome resistance wire is wound, at regular spacing, around the core as a continuous conductor, making contact with the bus-wires at the exposed points.

After completion of heater conductor winding a high temperature soldered joint is made at each contact point ensuring that a number of conductor strands are securely bonded to the bus-wires.

An extruded outer sheath is then placed over the core and heater element to complete the heater tape assembly. Providing Grade 2.1 to BS 6351.

For certain applications the heating tape may have a stainless steel braided outer cover.